/C++/List that doesn't allow duplicates c++

List that doesn't allow duplicates c++

#include<bits/stdc++.h>
#include <iostream> 
using namespace std;
int main()
{
    string s = "aaaabbbcccddd";
  // unordered_set doesn't allow for duplicates
    unordered_set<char> t(s.begin(), s.end()); 
    string u(t.begin(), t.end());
    sort(u.begin(), u.end());
    cout << u << endl;
    return 0;
}

Source: grepper.com

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